Evaporating-pan



(No Model.)

G. M. PIERCE.

EVAPORATING PAN.

No. 307,328. Patented Oct. 28, 71884.

W/T/VESSES A fform vs lhvree rates GEORGE M. PIERCE, OF EAGLEVILLE,OHIO.

EVAPORATING=PAN.

EZFEQ FICATION forming part of Letters Patent No. 307,328, dated October28, 1884-.

Application filed June-21,1884. (No mcdel.)

To all whom it may concern.-

Be it known that I, GEORGE .M. PIERCE, of Eagleville, in the county ofAshtabula and State of Ohio, have invented certain new and orating-pan,with portions broken away to show the internal construction. Fig. 2 isan enlarged View in perspective of a'east metal plate used inconstructing the pan. Fig. 3 is a View in perspective of a damperattachment. Fig. 4 is a view in perspective of the back end of theheater with the damper in position.

A represents an evaporating-pan divided in the central part by thetransverse partition B into two general compartments. The frontcompartment is located over the arch O, and has a corrugated bottom, thecorrugations 1? running lengthwise of the pan, but crosswise of thecompartment, and do not extend to the sides on either side of thecompartment. This compartment is subdivided by the partitions a, [2,0,(I, and c, that are joined in front to the end of the pan and at therear to the partition B. Thesepartitions are also joined to the bottomof the pan, but are so located that they each pass over and are joinedto the apex of a corrugation. The partition a has an opening at thelower rear corner and the partition I) at the lower front corner, and soon through these partitions. The sap is received intothe pan at thefront left-hand corner, and by means of thesepartitions and openings ismade to pass backward and forward through the compartment until it isdischarged through the opening I) in the partition B into the rearcompartment. The partitions in the front compartment are graduated inheight, the lowest being the outer partitions. a and e, and the highestis the middle partition, 0, the

central part of this compartment being dire'ctly over the central partof the furnace, where the heat is most intense and the agitation of theliquid at this point in boiling is most violent, and is sufficient todash the foam and scum over the partitions b and d, but not over thehigher central partition, 0. In the same manner the scum is dashed overthe lower partitions, a and 0; but the decreased ebullition toward theoutside is not sufficient to carry the scum over the partitions towardthe center. The scum therefore accumulates at the sides of the pan,fromwhence it may be easily removed. The rear compartment is 6 3. subdividedby the partitions f, g, 72, and 2', running crosswise of the pan, andeach of these partitions is secured on the apex of the corrugations r,as shown; otherwise the bottom of the rear compartment isflat. Thesepartitions are graduated in height. The rear partition, 2', should be ofconsiderable height, to prevent the sirup from boiling over, which it ismore inclined to do as it becomes thicker. The partitions h and 9 maytherefore be less in -7 5 height, and the partitions f still less,andcon siderable material saved thereby. The openings in these partitionsare arranged as shown, and the liquid in each sub-compartment or spaceis in a body extending across the pan and subjected throughout to aboutthe same degree of heat. As the liquid from the first space passesthrough thejopening in the partition f to the next space it is subjectedto less heat, and so on to the end of the pan. It is well known that inthe latter steps of the process, where the liquid is being convertedinto sirup, the heat should gradually decrease to prevent scorching theproduct.

I have found that with this construction of evaporatingpans theliquid inall of its stages is under the most favorable conditions foraccomplishing a speedy reduction and producing a superior product. Atthe back end of the pan is the heater H, that may be joinedto 5 the panand made a part thereof, or may be made separate, as preferred. Thisheater extends some distance below the pans. and rests on the ground orfoundation, so that the products of combustion must pass through thehorizontal tubes h in the lower portion thereof. A plate, I, is providedwith a handle, I,

extending througli the brick wall back of the heater. The front side ofthe plate is provided with conical plugs i, arranged to lit the tubes,

' and is used in combination with the dampers in front to control theheat. This device is found to be of great advantage in somewhatconfining the heat under the pans, resulting in a great, saving of fuel.\Vhen the tubes are unobstructed, nearly all of the heat passes throughthe upper row. 3y partially closing the tubes by thrusting these plugsmore or less into them, the heat compelled to pass alike through all. ofthe tubes, and they are all kept full of heated air, thereby greatly increasing the effective heatingsurfaee. cold sap is introduced into thisheater, and by ineans of heat that would otherwise be wasted is raisedusually to the boiling-point, so that when itis introduced to the pan infront it does not materially retard the boiling of the liquid at thispart. The sap is usually eonveyed from the heater to the pan in a pipeon the back side. (Not shown.) W'ith the ordinary construction there areusually weak places at the ends of the corrugations that support thepartitions where the openings in the partitions are. As a means ofstrengthening and securing these parts I have invented the device shownin Fig. 2. It consists of a single piece of cast metal, usually brass,and has a broad bottom, K, that is riveted and soldered to the bottomot'the pan, and an upright flange, L, secured in a like manner to theside of the pan, and a rib, m, that is secured to the partition, and atriangular part, a, that fits into and forms an end to the corrugation,and is soldered and riveted to secure the parts.

The opening under the rib m may be provided with a slide or gate, toregulate the flow of the liquid, if so desired. Two ot'these plates areshown in position on partitions g and a, and are preferably used on allof the partitions where openings occur.

The I \Vhat I claim is 1. An evaporating-pan, preferably rent-an gularin form, and divided in the central part by a transverse partition intotwo general conr partments, and the front compartment subdi-- vided bypartitions runningdengthwise of the pan, and the rear compartmentsubdivided by partitions running crosswise of the pan, and

the partitions each secured to the apex of a partition being in thecenter and the partitions on either side decreasing in height toward thesides of the pan, and in the rear compartment the partitions increasingin height toward the rear of the compartment, substair tially as setforth.

3. In an evaporating-pan, the heater II, provided with the tubes Ii, incombination with the plate I, provided with the conical plugs a, set soas to register with the tubes in the heat or, and provided with thehandle I, or equiva lent device, by means of which the tubes may be moreor less closed by introducing the plugs therein, substantially as setforth.

4. In an evaporating-pan, the metal plate K, provided with the flanges Land m, and the triangular piece 11., substantially as set forth.

In testimony whereof I sign this specifier tion, in the presence of twowitnesses, this 5th day of May, lSSt.

GEORGE M. PIER-GE.

\Yitnesses:

ALBERT 1 LYNCH, CHAS. H. Donna.

